我有带有 Postgres 9.3 的 Ubuntu 14.04，我正在尝试安装 Postgis 扩展。我发现的最推荐和最直接的方法之一非常简单：
sudo apt-get install postgresql-contrib postgis postgresql-9.3-postgis-2.1
但是，这会引发“未满足的依赖项”错误：
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies.
postgis : Depends: libgdal1h (>= 1.9.0) but …